juko | 651e3356441cd195c39a415163dc23891171574f4123a766b894304a7c41ae1a

General

Target
2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe
Size 88KB
Sample260419-p24ersfy21
SHA256 651e3356441cd195c39a415163dc23891171574f4123a766b894304a7c41ae1a
MD5 0f1303e88dd48e85c0d0af75fb1308c7
SHA1 c47a75a3a65dbad882fde28502f51827be6d0625
SHA512 d429770d89c73cdd88d3c54fd669ada7737dc6043662a160de17d66f6a2f8129d22d46d32cdd84bd8be88c09d7314e5ff2505413258b9165cc120a8f6a953a35
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:sLy2Kerc64CiGIm8so28wzCBlycJWeeq
TLSH
T134933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral1/files/0x0010000000021658-4.dat	family_juko
behavioral1/files/0x00080000000244d8-12.dat	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-1609746302-1884177235-1125644204-1000\Control Panel\International\Geo\Nation	2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1609746302-1884177235-1125644204-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
1968	WINWORD.exe
4600	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1609746302-1884177235-1125644204-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
5776	cmd.exe
3796	PING.EXE
4420	PING.EXE
4412	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4412	PING.EXE
3796	PING.EXE
4420	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4300 wrote to memory of 1968	4300	2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe	83
PID 1968 wrote to memory of 5776	1968	WINWORD.exe	84
PID 5776 wrote to memory of 3796	5776	cmd.exe	86
PID 5776 wrote to memory of 4420	5776	cmd.exe	88
PID 5776 wrote to memory of 4412	5776	cmd.exe	89
PID 5776 wrote to memory of 4600	5776	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-04-19_0f1303e88dd48e85c0d0af75fb1308c7_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4300
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1968
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\000013E4" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5776
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3796
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4420
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4412
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:4600

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

000013E4

Path C:\Users\Admin\AppData\Roaming\Mozilla\000013E4
Size 88KB
SHA256 d397ebdd3f2a00bd573aeeb17ecb51643fa314c48cc5b80322b22d88c7ac2e7e
MD5 95033e6235c8e80b5fc9d0ed06a68ac2
SHA1 a13a539bf5256e5a4558fdc0127f6881e9f2d612
SHA512 348c4d15cf4056128fe446c4e2d526d430e26afcc43c55b8a8425432cf657bc9c9a5d3ca5c555779ecd74b23ca4b44a0ac572594cfd9d4eea3172ad8b48dda2e
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsi:sLy2Kerc64CiGIm8so28wzCBlycJWeeF
TLSH
T155933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 651e3356441cd195c39a415163dc23891171574f4123a766b894304a7c41ae1a
MD5 0f1303e88dd48e85c0d0af75fb1308c7
SHA1 c47a75a3a65dbad882fde28502f51827be6d0625
SHA512 d429770d89c73cdd88d3c54fd669ada7737dc6043662a160de17d66f6a2f8129d22d46d32cdd84bd8be88c09d7314e5ff2505413258b9165cc120a8f6a953a35
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsx:sLy2Kerc64CiGIm8so28wzCBlycJWeeq
TLSH
T134933B2EA5A220FCCA57C170C6BB6B32D4357C251035B63E6344FF352E70E62A729E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads